Draw lines on map

Part of #852:

- [x] Draw lines on local map
- [x] Draw lines on global map before game starts

Instructions:
 - To draw, press Alt+Left Click on map.
 - To delete existing lines, just press Del key mousing over the line.
 - Line colors can be selected using the buttons on the top bar (next to the player name).
 - Player requires Map tools to draw during gameplay (but can delete lines).
 - Anybody can draw freely on the briefing screen. These lines are synced between all clients (including JIP).

![arma3 2014-08-23 18-50-34-06](https://cloud.githubusercontent.com/assets/7674951/4021946/a88d7b42-2b0f-11e4-867c-8b0d7006af6b.png)